Physics

Biography

Biography: Herman Holushko

Abstract

Type Ia supernovae play an important role of standard candles in modern cosmology. They also exhibit a phenomenon of
light curve broadening which increases with distance. It is widely accepted that the broadening is proportional to (1+z)
factor and strongly supports accelerated expansion of Universe. However, the analysis of the conducted research on the Type Ia
supernovae reveals some deficiencies and logical loops in it. To eliminate such problems, it is suggested to analyze observational
data by building light curves in observed bands without fitting to templates. Using observational data of 3-years Supernova
Legacy Survey (SNLS), the empirical light curves were built for each supernova in griz bands (whenever it was possible) in
natural (non-logarithmic) scale, for red shifts greater than 0.6. The theoretical predictions of light curves in observed griz
bands for different red shifts were obtained using computer simulation of light propagation from exploding supernova to
an observer. The simulation model uses the assumptions of the standard model on (1+z) time dilation. The input data for
computer simulation are spectra templates of typical Type Ia supernova explosion. The simulation model also considers light
extinction in our galaxy and filter transmission characteristics of the telescopes used in SNLS. The comparison of simulated
light curves with light curves built using SNLS observational data reveals violations of (1+z) time dilation hypothesis. Some
of the results point to the existence of dust in the intergalactic space. Recommendations for future observations of supernovae
were submitted to NASA and published on NASA web-site.